Tricopter (Y3) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tricopter-y3/  (sheet CC BY 4.0)
Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
Catalog version: 2026-10-20

Sizes: see table below
- A tricopter has three motors about 120 deg apart; the rear motor tilts on a servo for yaw, which gives good yaw authority without cutting thrust (Oscar Liang).
- It is less stable, its tail mechanics are crash-prone, and ArduPilot calls the type outdated.

parameter  value or range  source
Arm spacing  ~120 deg  Oscar Liang

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Oscar Liang: Types of multicopter — web — Publisher's page; dimensions are facts — https://oscarliang.com/types-of-multicopter
- ArduPilot: Archived: Advanced MultiCopter Design — web — Publisher's page; dimensions are facts — https://ardupilot.org/copter/docs/advanced-multicopter-design.html

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=tricopter-y3